It used to be thought that drinking coffee during pregnancy could contribute to ADHD - a potential problem for a monarch - but recent studies show that drinking moderate amounts of coffee during pregnancy may not be as bad for you as had been thought. A recent study suggests that women who take in less than 300 mgs of caffeine per day - about the same amount of caffeine as a grande latte with an extra shot, but a Dabnish study in 2003 found that women who drank more than eight daily cups of coffee during pregnancy increased their risk of miscarriage or stillbirth by as much as 300%.

So fair play to Kate for not taking any chances with the wellbeing of the future king or queen.

Escorted by a security guard, the 31-year-old Duchess "looked beautiful," according to Us Weekly.

"Her hair was done nicely and she had a scarf, lovely long coat and boots on." Still under wraps, although Middleton is now in her second trimester? Her baby bump. "She was wrapped up warm, so I couldn't see the bump," the observer explains.